js concat-vs-join

JavaScript performance comparison

Test case created by lexxpavlov

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var sample1 = "test";
    var sample2 = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum";
};
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
concat-short
var str = '';
for (i = 0; i < 10000; i++) str += sample1;
pending…
concat-long
var str = '';
for (i = 0; i < 10000; i++) str += sample2;
pending…
join-short
var str, arr = [];
for (i = 0; i < 10000; i++) arr[arr.length] = sample1;
str = arr.join('');
pending…
join-long
var str, arr = [];
for (i = 0; i < 10000; i++) arr[arr.length] = sample2;
str = arr.join('');
pending…

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